PLATE 10.5. 



Ptychophyllum stokesi. Niagara. 



1. Left lateral view of a corallum of average size. 



2. (Upper central specimen.) View of the calyx of a corallum. 



3. (Central Specimen.) Posterior view of a corallum attached by its 



radicels to an extraneous object. 



4. (Left central specimen.) Lateral view of coralla mutually attached. 



5. View of the calyces of three inosculated coralla. 



6. (Left upper specimen.) View of a proliferous corallum. 



7. View of the calyx of a corallum, invaginated within the inferior 



calyx. 

 All from the red clay of the Upper Niagara, near Louisville. 

 Example 5 from the collection of Mr. McConathy; example 6 from 



the collection of Mr. Nettelroth; the others from the collection 



of the author. 



Ptychophyllum invaginatum, Nov. Spec. Niagara. 



8. Right lateral view of a corallum, from the red clay of the Upper 



Niagara, one foot below the Niagara and Devonian passage- 

 beds, near Louisville. Collection of the author. 



Ptychophyllum ipomcea, Nov. Spec. Niagara. 



9. View of the calyx of the corallum figured in Plate 104, Fig. 7. 



10. (Lower central specimen.) Oblique right lateral view of a young 



gemmiferous corallum, from the Upper Niagara red clay, near 

 Louisville. Collection of the author, 



Omphyma verrucosa. Niagara. 



11. View of the calyx of a corallum, from the Upper Niagara white 



clay, near Louisville. Collection of the author. 



